Phasing Plug Adaptor With Concentric Rings for Smooth Frequency Response
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Solution Overview
Problem
Horn-loaded compression drivers face challenges in achieving optimal sound transformation and frequency response due to limitations in phasing plug design, particularly in midrange sound frequencies, leading to poor performance characteristics and audible irregularities.
Innovation Solution
A phasing plug adaptor with concentric rings and channels is introduced, featuring a flange and a body with tapered rings and channels that improve sound dispersion and equalize path lengths, enhancing acoustic wave propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional phasing plug is used in horn-loaded compression drivers, then the acoustic path compresses audio signals and equalizes path lengths, but the transformation of acoustic signals from compression driver to horn is unsatisfactory, resulting in poor frequency response characteristics and restricted bandwidth
Solution Approach 1:
The phasing plug is divided into multiple concentric rings with different functions. The first phasing plug portion includes circumferential slits for acoustic compression, while the second phasing plug portion includes radial slits for additional acoustic path management. This segmentation allows each portion to optimize specific aspects of acoustic transformation, improving overall frequency response and bandwidth simultaneously
Solution Approach 2:
The patent employs a nested structure where one phasing plug portion is positioned within or adjacent to another phasing plug portion. The concentric rings are arranged nested relative to each other, with inner rings handling high-frequency acoustic paths and outer rings managing lower frequencies. This nested arrangement enables complete acoustic signal transformation across the full frequency spectrum without interference
2Ease of operation
If a phasing plug is positioned adjacent to the diaphragm with sufficient space, then the phasing plug does not interfere with diaphragm vibration, but the area expansion is non-ideal introducing audible response irregularities such as horn midrange sound
Solution Approach 1:
Different regions of the phasing plug structure are assigned different functional properties. The circumferential slits in the first portion provide acoustic compression while the radial slits in the second portion provide area expansion. Each local region is optimized for its specific function, ensuring smooth frequency response while maintaining diaphragm vibration freedom through the overall nested configuration
3Power
If horn-loaded compression drivers are designed for midrange sound frequencies, then they achieve increased sensitivity and higher maximum SPL, but the practical implementation of effective phasing plug is limited, resulting in audible response irregularities
Solution Approach 1:
The phasing plug is segmented into concentric rings with specialized functions for midrange optimization. The first portion with circumferential slits handles acoustic compression for power generation, while the second portion with radial slits manages area expansion for frequency response smoothness. This segmentation enables midrange drivers to achieve both high SPL and reliable frequency response characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adaptor improves sound directivity and frequency response, reducing interference and distortion, and expanding the usable frequency range of horn-loaded compression drivers.
Implementation Method 1
The phasing plug typically has circumferential slits, radial slits, or holes that form an acoustic path for transfer of the sound energy from the compression driver to the horn. This acoustic path compresses audio signals from the compression driver and equalizes path lengths of the sound waves to reduce out of phase and destructive interference.
Implementation Method 2
This acoustic path compresses audio signals from the compression driver and equalizes path lengths of the sound waves
Implementation Method 3
The body is configured to increase an acoustic dispersion angle downstream of the exit profile
Data Source
AI summary
A phasing plug adaptor for a speaker assembly includes a plurality of concentric rings. An innermost ring defines a channel that is uninterrupted and coaxial with a longitudinal axis.